Projector cabinet



Dec. 4-, 1962 v, 5 MARK 3,066,993

PROJECTOR CABINET Filed July 25, 1960 3 Sheets-Sheet 1 INVENTOR VENNICE E. MARK ATTORNEYS Dec. 4, 1962 v. E. MARK PROJECTOR CABINET 3 Sheets-Sheet 2 Filed July 25, 1960 mm 7 ///H 7 6 5 H 0 m5 5 3 z nn 9 0 I 5 m w? k m zmw n w FIG. 6

ATTORNEY V. E. MARK PROJECTOR CABINET Dec. 4, 1962 r 3 Sheets-Sheet 3 Filed July 25, 1960 Fla. 8

INVENTOR. VENNICE E. MAPK BY MM ATTORNEYS United States Patent 3,066,993 PRGJECTOR CABINET Venuiee E. Mark, 1576 Fisk Road SE, East Grand Rapids, Mich.

Filed July 25, 1960, Ser. No. 44,951 12 Claims. (Cl. 3122(i) This invention relates to furniture, and more particularly to a combination support and concealed storage means for a movie projector or other projection instrument.

This invention may be used in an office or other business establishment and is primarily adaptable to provide a neat, convenient and compact piece of furniture for the home. It provides a combinaton support for a projector while in use, and concealed storage for the instrument when it is not in use. It has the additional advantage of providing both of these facilities without requiring that the instrument be removed from the unit. When the instrument is stored the cabinet can be used as a lamp table or for other comparable purposes.

This invention provides a firm support for the projection instrument which will withstand the vibration incident to use of this type of equipment. Yet it requires a minimum effort on the operators part to store the equipment or place it in the work position. This simplicity assures freedom from mechanical difficulty and durability in operation.

Heretofore, the usual facilities adapted for home and otfice use were stands, shelves and cupboards, or drawers. If the instrument is placed on a stand, it is usually subjected to an exposed type of storage. If the instrument is stored on a shelf in a cupboard or in a drawer, it is necessary that the equipment he set up each time it is used. This invention overcomes these problems, since the furniture can be placed in a position where the projection instrument is normally used, and is readily available with a minimum amount of effort.

This invention provides the further advantage of having the power source directly connected to the projection instrument at all times, whether or not the instrument is in the stored position or in the work position. The cabinet is also constructed so that it may sit adjacent any wall and have the cover thereof remain attached to the furniture yet lie adjacent the furniture when the projection instrument is in the work position. The cabinet also includes means for changing the projection angle of the projection instrument as an integral part of the unit. The cabinet further provides extra storage space wherein the film may be stored, providing ready accessibility for use with the cabinet.

It is therefore an object of this invention to provide a projection cabinet wherein the projector may be stored within the cabinet, and the cabinet may be used as a sup port for the projection instrument when in the work position.

Another object of this invention is to provide a projection cabinet wherein the cover of the cabinet may be rotated to a position adjacent the side or end thereof.

Yet another object of this invention is to provide means for tensioning the platform means of the cabinet upon which the projector or other instrument rests to eliminate any possibility of vibration between the platform and cabinet super-structure.

Another object of this invention is to provide a projector cabinet which has a means formed integral therewith for raising or lowering the projection instrument to vary the projection angle thereof.

Still another object of this invention is to provide a projection cabinet having storage area for both the projection instrument and film used therewith.

A further object of this invention is to provide a projection cabinet which includes an electrical conduit to the projection instrument so that a source of power is always available at the instrument. 7

These and other objects and advantages of this invention will become more apparent upon reading the specification in conjunction with the accompanying drawings.

In the drawings:

FIG. 1 is a perspective view of the projection cabinet showing the platform means in the work position, and a projector in phantom placed in the projecting position.

FIG. 2 is a cross sectional view of the projector cabinet taken along the section lines 11-11 of FIG. 1 showing the platform means in the extended position. 7

FIG. 3 is a cross sectional view as in FIG. 2, but showing the platform means in the retracted storage position.

FIG. 4 is a segmental cross sectional view taken along the section lines IVIV of FIG. 1.

FIG. 5 is a perspective exploded view of the platform means, showing the platform carriage frame, platform carriage, and the platform base which is in phantom.

FIG. 6 is a plan view of a segment of the projector cabinet showing the elevator block means.

FIG. 7 is a side elevational view of the projector cabinet showing the cover rotated to a position adjacent a side of the projector cabinet.

PEG. 8 is a cross sectional view taken along the section lines VIII-NIH of FIG. 7, and showing a novel hinge arrangement.

FIG. 9 is a perspective view of a segment of the projection cabinet showing a guide post for the platform carriage means, and the electrical conduit for supplying power to the projection instrument.

In the following description, the invention is described as one for a projection instrument. Although the invention is designed primarily for use with a projection instrument, within the broadest aspects of the invention it may be used with any other type of household or office appliance for which it is desirable to provide storage and a means of support when the appliance is utilized.

In executing the objectives of this invention, there is provided a hollow housing having a partition which divides the cabinet into a first and second. storage area. One storage area is covered and has access at one end of the cabinet. The other storage area is open at the top and receives an instrument carrying platform which is vertically slidable therein. The platform is a twopiece unit including a carriage and a base connected together; however, the base is movable with respect to the carriage. The housing includes vertically disposed guide posts which cooperate with the platform carriage and direct the vertical movement of the platform. Support means including a table which covers the second storage area and strips secured to the platform base cooperate to support the base in the work position. The base moves forwardly and has one end thereof supported by'the table, and the other end of the base is supported by the strips which rest upon the guide posts. Leaves are hingedly secured to opposite ends of the base, and provide means for maintaining the platform means in the stored position by cooperating with latch means formed on the partition and one end of the housing. One of the leaves also engages an elevator block which is associated with the table to change the instruments projection angle. One of the guide posts also acts as a conduit for an electrical connection between the projection instrument and a source of power. The cabinet is covered by a door which is hingedly secured to a side of the housing. A leaf of the hinge has a rotatable connection which allows the cover to rotate against the sides of the cabinet even though it is adjacent a wall.

The projector cabinet assembly is designated generally as 5. The assembly includes the cabinet housing 1% the cover 27, the hinge 40, the platform assembly 56', and the spring 90. Referring now specifically to the details of the invention, FIG. I shows the projector cabinet unit 5 and particularly the cabinet housing 10. The cabinet housing includes the sides 11 and 12, and the ends 13 and 14, all of which except end 14 are secured to the bottom 15 by any well-known means. The end 14 is a door allowing access to one of the storage compartments to be explained hereinafter. The sides 11 and 12, ends 13 and 14, and bottom 15 define a hollow housing area.

The housing is divided into a first and second storage area by the partition 16. The partition 16 extends between the sides 11 and 12, and is positioned at a point about three-fourths the distance along the length of the sides.

The small storage area is again divided by the shelf 17 which is positioned midway between the bottom and top of the housing and projects transversely of the partition 16. The small storage area is covered by a table 18 which is secured to the top of the partition 16 and overlies the shelf 17. The end 14 of the housing 10 is in the form of a door which is hingedly secured to one of the sides 11 and 12 allowing access to the storage area.

Guide posts 21 and 22 (FIGS. 2 and 3) are secured to the sides 11 and 12 and are disposed oppositely from each other. The guide posts 21 and 22 are spaced a short distance from the end 13'and function as a guide for the platform 50. One of the guide posts has an aperture 22 which extends substantially throughout the length of the guide post, and communicates with a cord receptacle 23 (FIG. 2) adjacent the bottom of end 13. An electrical cord 37 leads from a supply source through the cord aperture 28 and the conduit 22 to the projection instrument. A multiple receptacle plug (not shown) may be secured to the platform 50 and connected to the cord 37 to provide power to equipment other than the projector if'such an arrangement'is desired.

Adjacent the top of the housing 10, and secured to the sides 11 and 12 are stop rails 19 and 29 respectively (FIG. 4). The stop rails cooperate with tensioning means on the platform'stl to be described in greater detail subsequentlyf The stop rails 19 and 20 extend substantially the entire distance between the guide posts 21 and the partition 16.

Secured to the end 13 and the partition 16 are latch bars 23 and respectively (FIGS. 2 and 3). The latch bars are positioned at a point about three quarters the distance from the bottom of the cabinet. The latch bars 23 and 25 have beveled surfaces 24 and 25, respectively, formed on the bottom thereof. The beveled surfaces 24 and 25 are inclined upwardly toward the end 13 and partition 16 to form a latch surface which cooperates with a portion of the platform 50 in a manner to be described more fully subsequently. The latch bars are of a length so as toextend substantially the entire distance between the sides 11 and 12.

A cover 27 (FIGS. 7 and 8,) is secured to the cabinet side 12 by a hinge designated generally as 40. The hinge 41) has a leaf 41 which is secured to the side 13, a pivot pin 43 and a leaf 42 which pivots about the pin 43. A rotatable connector is secured to the leaf 42 and to an anchor plate 44 which is secured to the cover 27 in a well known manner. The connector pin 45 permits the cover 27 to rotate about the leaf 42 to a position adjacent the side 12 as best shown in FIG. 7. Pads 46 are secured to the cover 27 (FIG. 7) and prevent the cover from marring the side 12 when the cover is rotated into thls position. When it is desired to cover the cabinet, the cover 27 is rotated 180 degrees from the FIGURE 7 position, and is then pivoted about the pin 43 to cover the housing. This hinge and rotatable connector arrangement is particularly desirable when it is necessary to place the side of the cabinet which bears the hinge against a wall. With this hinge arrangement, the cover can be opened to a position adjacent the wall and the cover then rotated to a position adjacent the side of the cabinet.

The table 18 (FIGS. 2 and 3) performs the double func tion of supporting the platform 51 as will be explained later, and as a support means for an elevator block (FIG. 6) now to be described. The table 18 is provided with a pair of spaced slots 31 and 32 which are formed in a direction parallel to the cabinet sides 11 and 12. It is to be understood that within the broadest aspect of the inventic-n one or several slots may be used. The slots 31 and 32 are of substantial length so as to provide movement of fastener guides 3.3 and 34 therein. The fastener guides are secured to the elevator block 311 and guided by the slots 31 and 32. As seen in FIG. 6, the elevator block 30 can be moved to a position adjacent the end and door 14, and to a position adjacent the partition 16. The purpose of the block 30 will be explained more fully in the description of the operation of the invention. As shown in FIGS. 2 and 3, the table 18 is depressed or set inwardly from the top of the cabinet a sufi'icient distance so that the elevator block 30 which rests thereupon does not pro ect above the top of the cabinet and thus prevent closure of the cover 27 upon the cabinet units.

Although the elevator block 30 is shown with guide means, it is to be understood that within the broadest aspect of the invention an elevator block which is unattached and without guide means can be used as will be better shown in the description of the operation of the invention.

Associated with the large or first storage area is a platform assembly designated generally as 50 and best shown in FIGS. 2, 3, 4 and 5. The platform assembly. 50, has a base 51 which is adapted to support the projection instrument one type of which is shown in FIG. 1 in phantom, and designated generally as 95. Secured to the opposite ends of the base 51 by hinges 54 and 57 are leaves 52 and respectively (FIG. 2). The leaves 52 and 55 have beveled edges 53 and 56, which cooperate respectively with the beveled edges 24 and 26 on latch bars 23 and 25 re spectively. This is best shown in FIG. 3 wherein the beveled edges of the leaves engage the beveled edges of the latch bars and maintain the platform assembly 50 in the retracted or storage position. The leaves 52 and 55 are provided with handles 58 and 59 respectively (FIG. 1).

The base 51 is supported by a carriage). The carriage 60 is provided with slots or guideways 61, 62, 63 and 64. The guideways 61 and 62 are spaced from each other at one end of the carriage 60. They open upon that end of the carriage 60 and extend approximately one-fourth the distance toward the center of the carriage. The guideways 63 and 64 are spaced from each other at the opposite end of the carriage 60, and open upon the end thereof and extend approximately one-fourth the distance toward the center of the carriage. Fastener guides 69, 7t 71 and 72 operate respectively in the guideways 61, 62, 63 and 64. Each of the guide fasteners 69, 76, 71 and 72 are secured to the bottom of the base 51. Thus, the base 51 is connected to the carriage 60 but can move relative there'- to as limited by the guideways. The guide fasteners are.

ordinary wood screws; however, within the broadest scope of the invention other types of guide fasteners may be used. A common flat washer is placed between the heads of the guide fasteners and the bottom of carriage 60 to facilitate movement of the fasteners in the guideways.

The carriage 64) is secured to a carriage frame designated generally as 75. The carriage frame 75 is a framelike member having ends 76 and 77 to which are secured side beams 78 and 80 by any well known fastening means. The carriage frame 75 is wider than the base 51 and carriage 60 which are centrally located on the ends 76 and 77. This allows the base 51 and carriage 60 to pass between the stop rails 19 and 20 as shown in FIG. 4. However, the side beams 78 and 80 are of sufiicient width so as to engage the stop rails 19 and 20 as also shown in FIG. 4.

Guide notches 79 and 81 are cut in the respective side beams 78 and 80 (FIG. 5) and engage the guide posts 21 as best shown in FIG. 9. End 77 is the same width as the distance between the outside edges of side beams 73 and 8t) and thereby engages one side of the guide posts 21. Thus, the guide posts 21 are surrounded on three sides by the carriage frame 75 providing positive guidance for the platform assembly 50.

Tensioning screws 82 and 53 project from the top surface of side beam 80. Similarly tensioning screws 84- and 85 project from the top surface of side beam 78. These screws abut the respective stop rails 19 and 25. The tensioning screws may be shortened and lengthened to regulate the position at which the vertical travel of carriage 50 is stopped for purposes which will be explained more fully hereinafter.

Bearing strips 65, 66, 67 and 68 are positioned between the base 51 and carriage 60. These bearing strips provide for easy sliding movement between the base and carriage. Small ball bearings may be used in place of the strips 65 and 66 if such an arrangement is desired. The bearing strips 67 and 68 perform an additional function of supporting one end of the base 51 when it is in the work position. As shown in FIG. 5, the strips 67 and 68 extend a substantial distance beyond the side edges of the base. These strips are sceured to the base 51 at the very edge thereof and overlie the carriage frame end 77 as best shown in FIGS. 3 and 5. The strips 67 and 68 are thus positioned between the guide posts 21 and the housing end 13 when the platform assembly 50 is in the storage position. When the platform assembly 50 is extended and the base 51 moved forward relative to the carriage 60, the bearing and support strips 67 and 68- rest upon the top of the guide posts 21 as best shown in phantom in FIG. 9. The one end of the base 51 is supported by the strips 67 and 68, and the other end of the base is supported by the table 18.

A compression spring 99 (FIGS. 2 and 3) is located centrally in the platform assembly storage area. One end of the spring rests upon the bottom 15 of the cabinet and the other end of the spring engages the bottom of carriage 6i and is maintained in position thereupon by the positioning block 73 (FIG. 5) which is secured to the carriage bottom by any well known fastening means. The platform assembly 50 is thus urged to the extended position (FIG. 2) at all times by the spring 90.

Operation The operation of the projector cabinet unit 5 is extremely simple. For purposes of illustration it will be assumed that the projection instrument is in the stored position.

To place the projection instrument in the operative or work position, the cover 27 is lifted to a vertical position. The leaf 42 of hinge 40 will rotate about the pivot pin 43 which is associated with the hinge leaf 41 secured to the cabinet side. The hinge leaf 42 will assume a vertical position as shown in FIG. 8. The top 27 is then rotated about the rotating connector 45 and assumes the position adjacent the cabinet side 12 as shown in FIGS. 7 and 8.

The handles 58 and 59, positioned respectively on leaves 53 and 55, are next grasped and the Platform assembly 50 depressed slightly to release the leaves from the latch bars 23 and 25. The spring will then raise the platform assembly 50 to the extended position as hown in FIG. 2. The carriage frame 75 cooperates with the guide posts 21 positively directing the platform assembly 50 as it moves upwardly. The degree of extension of the platform assembly 50 is limited by the tensioning screws 82, 83, 84 and 85 which engage the stop rails 19 and 20. 1

The base 51 can now be moved relative to the carriage 60. By moving the base 51 in a forward direction, its one end is moved over the table 18. This end of the base is thus supported by the table 18. As the base 51 moves forwardly the bearing strips 67 and 68 pass over the ends of guide posts 21 and rest thereupon. Thus, the end of the base 51 which is associated with leaf 52 is supported by the guide posts 21.

By adjusting the tensioning screws 82 through 85 inclusive the base 51 can be drawn tightly onto the table 18 and the posts 21. Thus, when the base is slid into the work position it firmly engages the table and posts preventing vibration thereof which might be caused by the operating projection instrument. Also, the tensioning screws make it possible to use large tolerances thus facilitating manufacture of the platform assembly.

As shown in FIG. 2, the leaf 52 is supported by its hinged connection with the base 51, and the top edge of cabinet end 13. The leaf 55 is supported by the elevator block 30 as best shown in FIG. 2.

The projection instrument may remain on the platform assembly base 51 if this is the position which it is desired to project the picture. However, if it is necessary to raise the front portion of the projector to change the projection angle, this is easily accomplished by placing the front portion of the projector on leaf 55, and sliding the elevator block 30 toward the partition 18 to elevate the projector and thus change the angle of projection. The closer the elevator block 30 moves toward the partition 16 the more leaf 55 is elevated and the projection instrument therewith. Conversely, the closer the elevator block 30 moves to the door 14 the lesser the elevation. Although the elevator block 30 is shown connected to the table 18 and guide thereby, it is to be understood that an unattached elevator block may be utilized with equal effect.

The electrical conduit through the guide posts 21 provides a source of power at all times to the projector instrument 95, and the instrument is now ready for immediate use. Since film may be stored on the shelf 17, it is available by merely opening the door 14. Thus, the projection instrument can be supplied with film which is stored in the cabinet itself. This arrangement provides for utmost convenience.

The projection instrument is stored in the reverse manner of setup. The projection instrument 95 is centrally positioned on the platform 51. The base 51 is then slid in the reverse direction. The leaves 52 and 55 are rotated to a vertical position, and the platform assembly 50 pushed downwardly against the compression of spring 90. The beveled edges 53 and 56 of leaves 52 and 55 respectively are positioned under the latch bars 23 and 25 and the platform assembly 50 is maintained in the retracted or storage position thereby. The cover 27 is rotated degrees from its position adjacent the side of the projector cabinet and closed down upon the cabinet housing 10. The projector is thus stored.

The projector cabinet disclosed herein provides a piece of furniture whereby a projection instrument may be stored conveniently and quickly. The instrument is out of sight, and is protected from dust, dirt, and children or animals which might injure the instrument if stored openly. The cabinet includes storage area for not only the guesses instrument but film which is utilized with the instrument. This arrangement provides for utmost convenience when it is desired to show pictures. The novel manner in which the cover is secured to the housing allows the projection cabinet to be placed adjacent a wall and remain in this position since the cover can be rotated to a position adjacent the cabinet side without moving the cabinet. The table performs the double function of a support for one end of the base, and as a support and guideway for the elevator block. The elevator block in combination with the leaf provides a simple and efiicient manner of raising and lowering the front of the projection instrument to change the projection angle thereof. The projection cabinet can be used as another piece of furniture such as a light stand or end table when not being used as a support for a projector. At the same time the cabinet is operating as a storage area for the projection instrument and film or other articles. The cabinet is of a simple design and is therefore, virtually free from maintenance expenses. The projection instrument can be converted from its storage position to its work position, in a matter of a minute or two the equipment is ready for showing pictures.

While only one embodiment of this invention has been shown and described, it may be possible to practice this invention through the utilization of certain other embodiments without departing from the spirit and scope of the invention. Such other embodiments are to be included as a part of this invention as defined by the following claims.

I claim:

1. A cabinet comprising: a hollow housing open at the top for defining a storage chamber; a platform having a base and a pair of leaves hingedly joined to opposite ends of said base, said base being mounted on a carriage, guideways formed in said carriage and guide fasteners associated with said guideways and connected to said platform base whereby said platform may move relative to said. carriage and be guided thereby, said platform being slidably mounted in said storage chamber and retractable to a storage position and extendible to a work position, a table formed in said cabinet, said platform base when in the work position being movable to a position over said table and having an end thereof supported thereby, and bearing means located between said base and carriage and fixed to said base, said bearing means engaging guide means formed in said housing for supporting the other end of said base.

2. A cabinet comprising; a hollow housing open at the top for defining a storage chamber, a platform including a base, leaves hingedly secured to opposite ends of said base, a carriage having a frame slidably disposed in said housing, guide posts positioned in said housing and associated with said carriage for directing movement thereof, guideways formed in said carriage and guide fasteners slidable in said guideways and being connected to said base whereby said base is slidable relative to said carriage, bearing strips positioned between said carriage and base to facilitate movement therebetween, certain of said bearing strips extending beyond the edges of said base, a table formed in said housing, a portion of said base being slidable over said table and being supported thereby, and said extending bearing strips being slidable over said guide posts, and resting thereupon, supporting the other portions of said base.

3. A cabinet as in claim 2 wherein said table includes elevator means for elevating a leaf of said platform which is adapted to change the angle of projection of a projection instrument resting thereupon.

4-. A cabinet as in claim 2 wherein one of said guide posts includes an electrical conduit whereby a power source is adapted to always be connected to a projection instrument stored in said cabinet.

5. A cabinet as in claim 2 wherein said housing includes a cover; said cover being hingedly secured to said o 0 housing, said hinge including a rotating connector secured to said cover whereby said cover may be rotated to a position adjacent said housing.

6. A cabinet as in claim 1 wherein said housing has, a partition, a latch bar secured to said partition and a similar latch bar secured to an end of said housing, the ends of said leaves having beveled edges and engaging edges of a similar configuration formed on said latch bars, to maintain said platform in a retracted or stored position.

7. A cabinet comprising: a housing, a partition formed in said housing defining a first and second storage area, said first storage area being open at the top and said second area being covered with a table and having an access thereto, platform means slidably disposed in said first storage area and resiliently urged to an extended position adjacent the top of said housing and being retractable to a storage position; said platform means being a two piece unit and having a base portion slidable with respect to a carriage portion when in the extended position, an end of said base when moved forward being positioned to partially overlie said table and being supported thereby, and support means secured to the other end of said base and resting on means formed in said housing for supporting the other end of said base when the forward position.

8. A cabinet as in claim 7 wherein said housing includes stop rails on the sides thereof, and tensioning means carried by a carriage frame secured to said carriage and engageable with said stop rails for drawing said base into contact with said table and said support means into contact with said guide means, said tensioning means providing for large tolerances in the manufacture of said platform means.

9. A cabinet comprising: a housing having an open top and a storage area defined therein, instrument supporting platform means disposed in said storage area and guide means for directing vertical sliding movement of said. platform means between an extended position and retracted storage position, said platform means having a carriage portion and a base portion movable with re spect thereto; support means formed in said housing; said base being movable when said platform means is in the extended position over said support means and being supported thereby; cover means hinged to said housing, said hinge having a rotatable connection with said cover whereby said cover may be rotated to a position adjacent said housing; said base having leaves hingedly secured to opposite ends thereof; and said support means having elevator means movable toward and away from said base to raise and lower one of said leaves resting thereupon to change the angle of inclination of an instrument adapted to rest thereupon.

10. A cabinet comprising: a housing having an open top and a storage area defined therein, instrument supporting platform means disposed in said storage area and guide means for directing vertical sliding movement of said platform means between an extended work position and retracted storage position, said platform means having a carriage portion and a base portion movable with respect thereto; support means formed in said housing; said base being movable when said platform means is in the extended Work position over said support means and being supported thereby; and said guide means having an electrical conduit for supplying power to said instrument; said base having leaves hingedly secured to opposite ends thereof; and said support means having an elevator block movable toward and away from said base to raise and lower one of said leaves resting thereupon to change the angle of inclination of an instrument adapted to rest thereupon.

11. A cabinet comprising: a housing having an open top and astorage area defined therein, instrument supporting platform means disposed in said storage area and guide means for directing vertical sliding movement of said platform means between an extended position and retracted storage position, said platform means having a carriage portion and a base portion movable with respect thereto; support means formed in said housing; said base being movable when said platform means is in the extended position over said support means and being supported thereby; cover means hinged to said housing, said hinge having a rotatable connection with said cover whereby said cover may be rotated to a position adjacent a side of said housing; and said guide means having an electrical conduit for supplying power to said instrument; said base having leaves hingedly secured to opposite ends thereof; and said support means having an elevator block movable toward and away from said base to raise and lower one of said leaves resting thereupon to change the angle of inclination of an instrument adapted to rest thereupon.

12. A cabinet comprising: a housing having an open top and a storage area defined therein, instrument supporting platform means disposed in said storage area and guide means for directing vertical sliding movement of said platform means between an extended work position and retracted storage position, said platform means having a carriage portion and a base portion movable with respect thereto; support means formed in said housing; said base being movable when said platform means is in the extended work position over said support means 10 and being supported thereby; said base having leaves hingedly secured to opposite ends thereof; and said support means having an elevator block movable toward and away from said base to raise and lower one of said. leaves resting thereupon to change the angle of inclination of an instrument adapted to rest thereupon.

References Cited in the file of this patent UNITED STATES PATENTS 408,385 Kiefer Aug. 6, 1889 894,998 Backus Aug. 4, 1908 1,093,344 McLean Apr. 14, 1914 1,376,997 Borglum May 3, 1921 2,306,209 Elofson Dec. 22, 1942 2,336,416 Parker Dec. 7, 1943 2,468,683 Michal Apr. 26, 1949 2,754,537 Rose July 17, 1956 2,869,957 Mark Jan. 20, 1959 2,878,087 Mark Mar. 17, 1959 2,878,089 Mark Mar. 17, 1959 FOREIGN PATENTS 279,533 Great Britain Oct. 31, 1927 916,212 Germany June 24, 1954 

